81results about How to "Avoid Longitudinal Cracks" patented technology

Disclosed is a slab continuous casting chamfer crystallizer narrow-face copper plate capable of effectively controlling longitudinal cracks of corners. The working faces of a narrow-face chamfer copper plate (1), which contact with molten steel, comprise a chamfer surface (3), a chamfer surface (4), a plane portion (2) between the two chamfer surfaces, width portions (5 and 6) of the chamfer surfaces (3 and 4) at the positions of the upper opening of a crystallizer and width portions (7 and 8) of the chamfer surfaces (3 and 4) at the positions of the lower opening of the crystallizer. The narrow-face copper plate is characterized in that the sizes of the width portions (7and 8) of the chamfer surfaces at the positions of the lower opening are larger than those of the corresponding width portions (5 and 6) at the positions of the upper opening respectively, so that tapers are formed on the chamfer surfaces (3 and 4) from the width portions (5 and 6) of the chamfer surfaces (3 and 4) at the positions of the upper opening of the crystallizer to the width portions (7 and 8) of the chamfer surfaces (3 and 4) at the positions of the lower opening of the crystallizer, under the condition of different shrinkage masses of solidified shells of the inner width face and the narrow face of the crystallizer, air gaps formed on the chamfer faces due to large shrinkage mass of width faces are eliminated by means of the taper compensation on the chamfer faces, and the longitudinal cracks of the corners and the bleed-out accidents caused by the longitudinal cracks are avoided.

The invention provides a hot in-place recycling ultrathin overlaying machine of a bituminous pavement and a construction method thereof. The hot in-place recycling ultrathin overlaying machine of the bituminous pavement comprises an automobile chassis, an integral power device, an electric control system, a diesel tank, a receiving and transporting device, a material transfer hopper, a horizontal transporting device, a heating device, a hydraulic system, a recycling agent spraying system, a harrowing device, a distributing spiral device, a paving screed device, a cab, and an electric control operating floor, wherein the automobile chassis is a special automobile chassis. The hot in-place recycling ultrathin overlaying machine of the bituminous pavement finishes the continuous overlay repair work of the pavement through a series of processes such as receiving the materials, feeding the materials quantitatively, transporting the materials horizontally, spraying the recycling agent, harrowing, heating, distributing and paving the materials, ironing, and grinding and the like, and has the advantage of carrying out one-time maintenance on the defects such as loose, shallow vertical and horizontal cracks, track, slight crack, bituminous aging, pavement seepage and the like of a functional layer of the pavement. By adopting the invention, the antiskid resistance of the pavement is restored, the profile of the pavement is corrected, the appearance and the evenness of the pavement are improved, the pavement strength of the pavement is increased, the traffic noise is reduced, and the service life of the pavement is prolonged.

The invention discloses a method for splicing a highfill roadbed by adopting a pile-sheet retaining wall, comprising the following steps of: forming an operation platform by using an old roadbed (1), a cutting slope (5) and an excavation step (6); longitudinally constructing an excavation filling pile (11); hoisting the cutting slope (5) and the excavation step (6) layer by layer from bottom to top during construction; installing a reinforced concrete soil retaining plate (12) so that the reinforced concrete soil blocking plate (12) is in overlap joint with the excavation filling pile (11); constructing an excavation C10-C12 element concrete pile (9) and a C20 reinforced concrete pile follower (10) step by step; and filling and compacting filler (7) layer by layer to realize seamless overlap joint of an old road surface (3) and a new road surface (4). The method has the advantages of no increase of occupied land, simple and convenient construction machines, short construction period, low cost and simplicity in maintaining traffic moving, thereby being extremely suitable for road sections widened by using highfill.

The invention discloses a high fill road section connection method, comprising the steps of: conducting bored pile (12) construction vertically at a side slope of an old subgrade (1), connecting multiple bored piles (12) into a vertically continuous bearing platform by means of a reinforced concrete supporting beam (11), the top surface of which is paved with a hardcore bed (10), and carrying out retaining wall (9) construction on the hardcore bed, when the retaining wall strength reaches over 75% of a designed strength level, performing cut slope (5) and step (6) excavation construction to the old subgrade slope, implementing filler (7) filling layer by layer and layering compaction, and finally paving newly connected wide pavement (4). The method of the invention restrains lateral deformations of a new subgrade (2) by means of various supporting and retaining structures, and opposes vertical deformations caused by various loads through a foundation reinforcing structure formed by the bored piles (12) and the reinforced concrete supporting beam (11), thus reaching the purposes of a stable overall structure and usage requirement satisfiable deformations.

The invention discloses a stress absorption band and a construction method thereof. The stress absorption band (3) is arranged at the joint part of a new road (2) and an old road (1), namely from the top surface of a roadbed to the underside of a newly paved oil surface, the stress absorption band (3) is arranged into an inverse trapezoid or an inverse triangular groove, and the groove is filled with asphalt macadam or modified asphalt macadam. The invention also discloses the construction method for the stress absorption band. The stress absorption band (3) is arranged at the joint part of the new road and the old road, can absorb and reduce stress, and prevent road surface diseases caused by the stress at the joint part of the new road and the old road.

The invention discloses a foamed light soil construction method. After the construction of a reinforced concrete protection wall and a soil subgrade is completed, foamed light soil is poured on the soil subgrade, and a galvanized wire mesh, a cushion layer and a reinforced concrete pavement are adopted on the foamed light soil so as to form a pavement structure; the foamed light soil is prepared through the steps of preparing a foaming agent into foams by using a physical method, then adding the foams into slurry prepared from cement, aggregates, admixtures, additives and water through a foamed light soil automation machine, mixing and stirring the obtained mixture through the foamed light soil automation machine, then conveying the obtained object by a guide pipe, and carrying out pouring molding and maintenance on the obtained object so as to obtain microporous light soil. The method disclosed by the invention greatly improves the construction quality of the foamed light soil, and effectively guarantees the molding standard of the foamed light soil.

The invention discloses a plate supporting type embankment structure for post-construction settlement controlling of a deep soft soil foundation on a high-grade highway. A reinforced concrete plate is arranged as a hard shell layer between the soft soil foundation and embankment earth filling, the thickness of the concrete plate ranges from 300 mm to 1000 mm, the concrete plate can be located above the earth surface or be partly embedded into the foundation or be fully embedded into the foundation, a cushion layer can be arranged at the bottom of the concrete plate, the slope ratio of the embankment earth filling is smaller than 1:1.5, the slope surface is wrapped by geotextile, a low retaining walls can be arranged on each of two sides of the concrete plate, the two sides of the concrete plate are close to the edges of the embankment, the bottom of each low retaining wall is fixed with the concrete plate, and overall deformation is achieved. By means of the plate supporting type embankment structure for the post-construction settlement controlling of the deep soft soil foundation on the high-grade highway, differential settlement of the embankment edges and the embankment center is eliminated, longitudinal cracks of the foundation are avoided, an embankment side slope can not lose stability and not be damaged, and compensation earth volume of the embankment earth filling is decreased. Compared with drainage concretion methods, by means of the plate supporting type embankment structure, post-construction settlement is effectively reduced. Compared with composite foundation methods, the plate supporting type embankment structure is low in cost. According to the plate supporting type embankment structure for the post-construction settlement controlling of the deep soft soil foundation on the high-grade highway, construction time is short, construction time of the earth filling is merely considered, and the plate supporting type embankment structure is particularly applicable to ordinary road sections on the deep soft soil foundation.

The invention relates to a construction method for widening and ribbing a heavy-thickness sub-base of a cold-plateau highway. Firstly milling is conducted on an old road base and an old road sub-base, then roadbed padding at the seam of an old road roadbed and a new road roadbed is solidified to form a roadbed seam hardened zone; then a layer of bed base reinforcing mesh is laid along the top surfaces of the old road roadbed and the new road roadbed, and a corner-part anchor-connection rib and a seam dowel bar are implanted to the vertical seam of a new road sub-base and the old road sub-base; then paving, laminating and maintaining construction of the new road sub-base are conducted; and after the new road sub-base forms strength, seam seam-body-pouring construction and seam-board-separating construction are sequentially conducted, post-grouting is conducted on the new road sub-base of a road shoulder part through a post-grouting pipe to form a base slurry-solidifying zone, and finally construction of a roof water-resisting layer and roof reinforcing mesh is conducted. According to the construction method for widening and ribbing the heavy-thickness sub-base of the cold-plateau highway, not only can the differential deformation at the seam of the new road base and the old road base be controlled, but also the heavy-thickness sub-base can be prevented from generating cracking disease, and the problem that the degree of compaction on the road shoulder part is not sufficient can further be solved.

The invention discloses a titanium-adding technology in medium carbon and structural alloy steel slab to prevent diastema. The aim of the invention is to provide a process to use titanium as a substitute for aluminium in terminal deoxidization, ingoting and annealing process to prevent diastema The gross mass comprises 0.03%-0.06% of terminal deoxidization agent titanium and 0.02%-0.04% of terminal deoxidization agent aluminium. Ingoting and annealing process: no need to move forward to annealing process pit or hood for annealing process after more than 6-10 times the time when melted iron is injected into mould, demoulding and when steel slab surface temperature decreases to the temperature bellow 100 Deg. C warehousing-in after qualification test. Without demoulding and annealing in pit or hood just after congealing of milted iron, this invention prevents diastema of medium carbon and structural alloy steel slab, so it reduces intensity of labor, cancels pit or hood installation, more importantly it reduces diastema substantially and shortens period of production. This invention not only decreases capital loss but also guarantees quality.

The invention relates to medium carbon steel casting powder for H-section steel continuous casting, belonging to the technical field of steelmaking and continuous casting. The medium carbon steel casting powder comprises the following components in percentage by weight: 33-39 percent of CaO, 35-39 percent of SiO2, 4-7 percent of Al2O3, 0-3 percent of MgO, 5-9 percent of F<->, 10-12 percent of Na2O, and balance of composite carbon which comprises 7 percent of graphite and 1-2.5 percent of carbon black, wherein the CaO and the SiO2 are used as base materials; and the Na2O, the MgO, the Al2O3 and the F<-> are used as flux. A preparation process comprises two steps, i.e. the step of producing pre-molten materials and the step of producing finished product casting powder. The prepared casting powder has physical properties that the melting point is 1080-1096DEG C, the viscosity at 1300DEG C is 0.17-0.35Pa.s and the melting speed is 30-40s. The thickness of the molten flux layer of the casting powder is 10-13mm. According to the requirement of carbon steel on the casting powder during production of an H-section steel continuous casting machine, the flux film control goals of lower melting temperature, lower viscosity, proper melting speed and higher thermal resistance are realized, and the situation that the surface of a casting blank is longitudinally cracked because the temperature gradient of the cross section of the casting blank is too large is avoided. The medium carbon steel casting powder has a better using effect than the using effect of domestic and foreign similar products, and can fully meet the process requirement on the carbon steel during H-section steel continuous casting.

A golf club shaft is 35-50 percent lighter than a conventional shaft while maintaining the outer diameter and structural characteristics of conventional shafts. The shaft has at least four layers of fiber reinforced material. The fiber reinforced layers are from innermost to outermost: a first angled layer; a first straight layer; a second angled layer; and a second straight layer. The angled layers are formed by bonding together two materials, each with fibers aligned in different directions. The second angled layer maintains the proper strength and rigidity of the shaft while keeping the shaft as light weight as possible. Aligning the second layer's fibers at an angle of 35-75 degrees with respect to the longitudinal direction of the shaft ensures proper weight and strength characteristics of the shaft. The resulting shaft is light-weight and exhibits the flexural rigidity, flexural strength, torsional rigidity, torsional strength, and crushing strength of conventional shafts.

The invention discloses a pressure steel pipe reinforcement composite concrete pipe, a manufactured pipe and a manufacturing method. A pipe body consists of a concrete outer pipe, a rubber pipe, a steel pipe and a concrete inner pipe arranged in sequence from outside to inside; the manufactured pipe is to insert an insertion port part of one pipe into a bearing port part of the other pipe and to uniformly coat polysulfur sealing paste in the joined place. The manufacturing method comprises manufacturing of a bearing port steel ring and an insertion port steel ring, manufacturing of a steel pipe, derusting and polishing of the steel pipe, leakage point detecting, bonding of the rubber pipe, manufacturing of a reinforcement skeleton cage, installing of an inner mold, installing of the steel pipe and the reinforcement skeleton cage on a chassis, sleeving of an outer mold, inserting of concrete into the mold, vertical vibration molding, port leveling, removing of the inner and outer molds, coating of corrosion resisting paint on the surfaces of the bearing port steel ring and the insertion port steel ring, coating of polyurethane on the end surface, finishing and inspecting, marking and curing, and carrying out inspection. The product can effectively overcome the longitudinal crack phenomenon on the inner and outer walls of the pipe due to higher internal and external pressure on the pipe.

The invention discloses a production process of a honeycombed SCR (selective catalytic reduction) catalyst with pyrophyllite as a carrier, belonging to the fields of nitric oxide after-treatment and purification and environment-friendly catalytic materials. The catalyst has three layers of microstructures, wherein pyrophyllite forms a carrier layer; tungsten-doped titanium dioxide (TiO2-WO3) forms a transition layer; and vanadium pentoxide (V2O5) forms an active layer. The catalyst has the beneficial effects that the negative effects of trace elements Na and K in pyrophyllite on the activity of the honeycombed SCR catalyst can be avoided by the design of the three layers of microstructures; pyrophyllite has the characteristics of low moisture expansion and high heat stability; as the carrier, pyrophyllite is favorable for improving the yield in the catalyst drying process and is favorable for improving the mechanical strength of the catalyst, and the cost of the catalyst can be also reduced by reasonably adding pyrophyllite; and the catalyst has high lateral and longitudinal mechanical strength, has denitration efficiency of more than 89% at a temperature of 270-500 DEG C, and has denitration efficiency of more than 94% at a temperature of 330-430 DEG C.

The invention discloses a long and short pile plate structure for controlling differential settlement of a highway transition section and a construction method thereof.The long and short pile plate structure comprises a transition section and a common section, reinforced concrete slabs are arranged on the transition section and the common section, and a plurality of prestressed pipe piles are arranged in the transition section and located below the reinforced concrete slabs; a plurality of cement mixing piles are arranged in a common road section below the reinforced concrete slab, the prestressed pipe piles and the cement mixing piles are directly and rigidly connected with the reinforced concrete slab, the lengths of the prestressed pipe piles are gradually decreased in the bridge road direction, and the pile intervals of the cement mixing piles are gradually decreased in the road bridge direction. The long and short pile plate structure and the construction method are good in reinforcing effect, reliable in technology, economical and reasonable, and uniform transition of longitudinal rigidity of the highway bridgehead transition section in the soft soil area can be achieved.

The invention relates to a method for treating a corbel with a longitudinal crack in a riverine highway, overcoming the defect that the prior art comprising the prior radical treating effects of excavation, back filling, grid laying, grouting, impermeable wall setting and the like can not fundamentally inhibit the destruction function of transverse pulling force to beds. The invention adopts the corbel as a reinforced concrete member, the corbel is longitudinally laid perpendicular to the highway below the face of the highway, and the development and the extension of the longitudinal crack can be effectively prevented by utilizing the favorable tensile property of steel bars. Namely, the corbel has the function of strengthening the tensile capability of embankment foundation soil bodies or fillers, the placement direction of the steel bars inside the corbel is vertical to the direction of the crack, the steel bars can completely bear transverse horizontal force borne by the beds because of favorable tensile property, the longitudinal cracking of the beds is prevented, and the reflection and the diffusion of the longitudinal crack of the beds towards the face of the highway are thoroughly cut off. For the service life of the highway, the steel bars are wrapt by a concrete material, and the durability of the steel bars can be effectively ensured.

The invention provides a method for avoiding crack formation of medium-high carbon steel during hybrid welding. The method comprises the steps that a vacuum chamber and a casting blank are preheated till the temperature of the casting blank reaches 290-310 DEG C; the welding speed of a hybrid welding gun is set to be 7.9-8.2 m/s, and the welding current is set to be 340-360 ma; a short edge is welded on the portion below a pre-welded weld joint at the end of the casting blank in parallel before welding; after the two ends and one edge part are welded, the other edge part is welded to be closed after 1.9-2.1 hours, and a long edge is welded to the lower portion of the other edge part in parallel; and a composite plate blank continues to be placed in a closed welding machine room for 12-15 hours after welding is finished. By the adoption of the method, longitudinal cracks generated in the vacuum hybrid welding process of the medium-high carbon steel are effectively avoided, so that the treatment workload is reduced, the production cost is reduced, and the quality of a composite steel plate is greatly improved.

A transverse pre-stress I-shaped box girder structure is composed of a plurality of I-shaped beams (1) arranged in the longitudinal direction; wet joint concrete (2) is added between every two I-shaped beam top plates, and a plurality of concrete transverse partition plates (6) are arranged in each I-shaped beam; transverse reserved hole channels (5) are formed in the positions, provided with the concrete transverse partition plates, of each I-shaped beam, and transverse pre-stress ribs (3) are arranged in the reserved hole channels; the joint of every two I-shaped beam bottom plates is also provided with wet joint concrete (2); pouring reserved holes (8) are formed in the positions, corresponding to the connection positions of the concrete transverse partition plates, of the I-shaped beam bottom plates. The device is reasonable in structure, the transverse pre-stress ribs and the longitudinal pre-stress ribs form a pre-stress network framework, the overall rigidity of a bridge structure is improved, the overall stability and durability of the bridge structure are greatly improved, and the maintenance cost is reduced. Construction is convenient, the I-shaped beams can be prefabricated in a factory, and then a small amount of cast-in-place can be conducted on site, so that the quality is easy to control, transportation is convenient, and the construction cost is reduced.

A thermal barrier coating and the preparation method of the thermal barrier coating relate to a coating and the preparation of the coating, in which the issues that the relative sliding and falling of the material interface parallel to the direction of the high temperature nickel-based alloy and the vertical cracking of the thermal barrier coating perpendicular to the direction of high temperature nickel-based alloy in high temperature and in the prior art are resolved. The thermal barrier coating is composed of an external ceramic layer (1) and an internal combined layer (5), wherein the internal combined layer (5) is composed of a high temperature nickel-based alloy layer (4) and a bonding layer (2) linked with the external surface of the high temperature nickel-based alloy layer (4). The bonding layer (2) is composed of a nickel nano-wire (3) and yttria stabilized zirconia. According to the preparation, the nickel nano-wire connected to the high temperature nickel-based alloy layer is obtained through the electro-deposition on the outer surface of the high temperature nickel-based alloy layer. And then the sol of yttria stabilized zirconia is sprayed, and the bonding layer (2) is obtained after the calcinations. Afterwards the ceramic layer (1) is prepared on the bonding layer (2), so that the thermal barrier coating is obtained. In the invention, the horizontal and vertical directions of the thermal barrier coating are closely integrated.

A soilbag roadbed and a method. The soilbag roadbed comprises soilbags, a roadbed substrate, a soilbag roadbed, a pavement and a surface protection. Soilbags are staggered vertically and horizontally and stacked up layer by layer from the roadbed substrate to be tightly combined with asphalt, concrete or broken stone paved on the pavement. The invention is simple, practical, thrift and economical and has substantial social and economic benefits.

The invention discloses a technology for settlement control of a hollow rigid plate after construction of a deep soft soil foundation of a high-level road embankment. The technology comprises the following steps: flattening a roadbed, and filling a broken stone hardcore; mounting a template on the spot; blending and conveying concrete; spreading and vibrating the concrete; setting a joint; finishing a surface; maintaining the concrete and jointing; and filling a road embankment. The template is a template with holes, and the holes are linearly arranged on the template. The direction of the holes at two sides is perpendicular to the road driving direction and is parallel to the road cross-section direction. The diameter of each of the holes is gradually changed, and the diameter of each of the holes in the center of the road embankment is smaller than the edge of the road embankment by 30-50%. Two layers of horizontal steel bars and longitudinal steel bars are distributed at the bottom of a hollow concrete plate, so that the non-uniform settlement of the center and the edges of the road embankment can be effectively reduced.